Application of welding and cutting equipment in the shipbuilding industry

At present, there are 1,101 shipbuilding enterprises of a certain scale in China, and the number of enterprises in the whole industry is estimated to reach more than 3,000. In 2008, the total industrial output value was 411.4 billion yuan and the output reached 22 million deadweight tons. From 2004 to 2008, the shipbuilding industry has doubled. In 2008, China's shipbuilding industry achieved an output value of 411.4 billion yuan. From 2004 to 2008, the compound growth rate reached 41%. China is the world's largest shipbuilding country. Figure 1 shows the output value of China's shipbuilding industry from 2004 to 2008.

Affected by the financial crisis, the average growth rate of the respondents in 2009 decreased to 3.4%. According to China's shipbuilding industry adjustment and revitalization plan implementation rules, and strive to achieve 50 million tons of shipbuilding output in 2011, to achieve this goal, it is predicted to continue to maintain rapid growth in the future. At the same time, with the country's policy of stimulating domestic demand, the demand for replacement of inland ships is released, and international trade is further warming up. As a manufacturing power, China's ship industry is optimistic. Driven by various factors, the shipbuilding industry will continue to maintain rapid growth.

Figure 1: Annual output value of the shipbuilding industry from 2004 to 2008

Ship welding technology is one of the key technologies in China's modern shipbuilding mode. Improving production efficiency, shortening shipbuilding cycle, reducing manufacturing costs and improving manufacturing quality are the eternal themes of the entire shipbuilding industry. The welding process plays an important role in the whole ship manufacturing process. The ship welding time accounts for about 40% of the total hull manufacturing time, and the welding cost accounts for 30-50% of the total hull manufacturing cost. It can be seen that the welding and cutting equipment is in the shipbuilding industry. The importance of it.

Hongmei Economic Information Consulting Co., Ltd. conducted market research on welding and cutting equipment in the second half of 2009. The ship industry has been a key application industry for welding and cutting equipment. Seventeen companies have been sampled in the shipbuilding industry, including ocean-going vessels. Large-scale shipbuilding enterprises, such as Dalian Shipbuilding Heavy Industry, and enterprises mainly based on inland river vessels, such as Wuhu Xinlian Shipyard.

In the statistics on the holdings of 17 shipping companies, the average number of welding and cutting equipment owned by shipbuilding enterprises reached 1,468, of which 441 were inverting welding and cutting equipment, and 1,027 were traditional welding and cutting equipment. The maximum possession amount is about 3,000 units, which is Hudong Zhonghua Shipbuilding (Group) Co., Ltd. Compared with other industries, such as steel structure, general machinery, rail vehicles, and construction engineering, the shipbuilding industry has the highest level of possession, and is the industry with the most concentrated demand for welders in various industries.

Figure 2: Ship industry demand and use of welding and cutting equipment

In the observation of the quantity of purchases, in 2009, 94% of the shipping companies purchased welding and cutting equipment, and the average purchase price was 15,543 yuan/set. These companies purchased an average of 135 welding and cutting equipment, including 71 inverter welding equipment and 64 conventional welding and cutting equipment. The proportion of inverters in new procurement is much higher than the proportion of inverters in the quantity of possession. The significant difference between these two proportions reflects the broad application prospect of inverter welding and cutting equipment in the shipbuilding industry. Traditional models are the trend of future development.

Among the companies visited, 65% of the companies believe that inverter welding and cutting equipment will further replace traditional welding and cutting equipment, and most enterprises believe that the proportion of inverter welding and cutting equipment exceeds that of traditional equipment. After calculation, the proportion of inverter welding equipment in welding and cutting equipment will increase to 86% in 9-10 years. The main reason for leading this trend is that the inverter welding and cutting equipment is small in size and easy to handle; the energy-saving and high-efficiency features are in line with national policies. Most of the users surveyed have recognized the inverter welding and cutting equipment technology to meet the needs and development trends of users. It is considered that the inverter welding and cutting equipment is energy-saving, energy-saving and easy to work in the field.

In terms of automation and mechanization level, the shipbuilding industry is relatively high, and CO2 gas shielded welding technology has become a mature process technology in the shipbuilding industry. With the development of China's shipbuilding industry and the continuous improvement of the manufacturing level, the welding equipment industry will be further improved in adapting to the use requirements. The proportion of inverter welding and cutting equipment will increase year by year and reach the main position; the proportion of various welding process structures will also be In the direction of more energy-saving, clean and efficient, the proportion of gas-fired welding will be further expanded.

Research project introduction

The definition of welding and cutting equipment in this project: The welding and cutting equipment mentioned in this paper refers to the equipment that is welded and cut by the heating energy provided by the arc. Does not include other welding and cutting equipment, such as resistance welding, brazing, flame cutting and so on. The classification of equipment mainly includes: electrode arc welding equipment (manual welding), gas shielded welding equipment, argon arc welding equipment, plasma cutting equipment, and others (including submerged arc welding, stud welding, etc.).

The survey lasted more than 2 months, and the total number of research companies exceeded 350, including about 80 welder equipment manufacturers, including almost all major domestic manufacturers; about 200 industry users, involving 13 industries; about 70 dealers; industry associations More than ten upstream product suppliers. Covers all active welding and cutting equipment production and application areas in the country.

The number of research companies in the shipping industry is 17 respectively:

â– Wuhu Xinlian Shipbuilding Co., Ltd. â– Zhoushan Longshan Shipyard Co., Ltd. â– Yiyang Zhonghai Ship Co., Ltd. â– Fujian Southeast Shipyard â– Zhongzhou Guijiang Shipbuilding Co., Ltd. â– Shandong Weihai Shipyard â– China Changhang Group Qingshan Shipyard â–  Guangzhou Shipyard International Co., Ltd. â–  Hudong Zhonghua Shipbuilding (Group) Co., Ltd. â–  Tianjin Xingang Shipyard â–  Hunan Changsha Shipyard â–  China Yangtze River Shipping Group Shipbuilding Heavy Industry Co., Ltd. Yichang Shipyard â–  China Shipbuilding Xijiang Shipbuilding Co., Ltd. â–  Dalian Shipbuilding Industry Group Co., Ltd. â–  Guangzhou Wenchong Shipyard Co., Ltd. â– Wuhan Nanhua Huanggang Jiangbei Shipbuilding Co., Ltd. â– Hubei North Shipbuilding Co., Ltd.

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